On some computers with Houdini installed, when I try and start the Help from within Houdini (Help > Houdini Help), I get an error.

I get a pop up box with the message:
“The UrL is no valid and cannot be loaded”

Then after closing that I get a pop up box with the message:
“BrowserLoad: Exception” …. etc

Then in the console it says:
Error: Could not communicate to open URL
Error: Could not communicate to set home page
Error: Could not communicate to show/hide TOC
Error: Could not communicate to show/hide UI

Does anyone have any idea what this might be? Must be an install issue. I am using Windows Vista